Drop-free bile duct stent

Abstract

The utility model provides a bile duct stent without damage and falling, which is a single-channel tube, and a single channel is arranged in the bile duct stent; the bile duct stent comprises a first tube section, a second tube section and a third tube section, the first tube section is arranged at the head part, the second tube section is arranged at the body part, and the third tube section is arranged at the tail part; the first pipe section is of a conical structure; a plurality of first side holes are formed in the pipe wall, close to the first pipe section, of the second pipe section, and the first side holes are communicated with the single channel; the third pipe section is in a single pigtail shape, a side hole is formed or not formed in the pipe wall of the third pipe section, a positioning barb is arranged at the joint of the first pipe section and the second pipe section, and a side hole is formed or not formed in the pipe wall of the positioning barb. The duodenal papilla drainage tube is placed in the common bile duct across the duodenal papilla to play a role in draining bile, can automatically fall off, and does not damage the wall of the bile duct, the duodenal papilla and the intestinal wall in the falling process.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a bile duct stent that does not fall off due to damage. Background Art

[0002] Endoscopic retrograde cholangiopancreatography (ERCP) is one of the minimally invasive surgical methods for the treatment of hepatobiliary and pancreatic diseases, with the advantages of less trauma, quick recovery, and strong repeatability. During the ERCP operation, selective bile duct intubation, sphincterotomy, balloon dilatation of the sphincterotomy, lithotripsy, and stone removal will cause edema of the duodenal papilla, resulting in poor bile excretion, which in turn induces acute cholangitis. In order to prevent the occurrence of acute cholangitis after ERCP, nasobiliary or bile duct stents are often left in place. The nasobiliary duct can cause discomfort in the patient's throat and upper abdomen. The nasobiliary duct can be removed after being left in place for more than 24 hours, and acute cholangitis will not occur again. In order to avoid the discomfort caused by the nasobiliary duct, bile duct stents are often used clinically to prevent cholangitis after ERCP.

[0003] At present, the bile duct stents used to prevent acute cholangitis after ERCP include ordinary bile duct stents and single pigtail bile duct stents. Among them, the probability of ordinary bile duct stents falling off by themselves is low. After the edema of the duodenal papilla subsides, a second endoscopic operation is required to remove them. The single pigtail stent can fall off by itself, and the rate of spontaneous falling off exceeds 80% one month after surgery, so it is more widely used in clinical practice. The single pigtail bile duct stent currently used in clinical practice has a side wing on the wall of the head end to prevent the stent from falling off early, and the tail is in the shape of a single pigtail, which can promote the falling off of the bile duct stent. However, there are the following shortcomings in the clinical application of single pigtail bile duct stents: 1. Patients are generally fasting within 24 hours after ERCP, and a semi-liquid diet for 24 hours to 1 week, and gradually resume a normal diet after 1 week. When the patient is fasting and taking antispasmodic drugs, the single pigtail bile duct stent will hardly fall off within 24 hours after surgery. When the patient is on a semi-liquid diet, due to the small amount of visible food and the side wings at the head of the single pigtail bile duct stent, the rate of spontaneous detachment of the single pigtail bile duct stent is still low. Only after resuming a normal diet and having more visible food, the side wings can fall off through the restraint of the duodenal papilla under the impetus of intestinal peristalsis. Therefore, the detachment rate of the single pigtail bile duct stent is low within 1 week after ERCP, and the detachment rate gradually increases after more than one week. 1. 24 hours to 1 week after ERCP, chyme can flow back into the common bile duct through the gap between the stent wall and the duodenal papilla. Bile salts and other formed elements in the bile will form common bile duct stones with chyme as the core, leading to postoperative stone recurrence; 2. During the external movement of the stent, the side wings can get hung on the duodenal papilla, causing the stent to fail to fall off on its own and requiring a second endoscopic removal; 3. When the side wings of the single pigtail bile duct stent are hung on the duodenal papilla, due to the traction of food and intestinal peristalsis on the tail of the single pigtail bile duct stent, the side wings can strongly stimulate the duodenal papilla, which can lead to complications such as acute cholangitis, acute pancreatitis, and duodenal papilla bleeding. Utility Model Content

[0004] According to the technical problem raised above, a bile duct stent without damage and falling off is provided. The technical means adopted by the utility model are as follows:

[0005] A bile duct stent that does not fall off due to damage, the bile duct stent being a single-channel tube with a single channel provided inside;

[0006] The bile duct stent comprises: a first pipe segment, a second pipe segment and a third pipe segment connected in sequence, the first pipe segment is arranged at the head, the second pipe segment is arranged at the body, and the third pipe segment is arranged at the tail; the front parts of the first pipe segment and the second pipe segment are straight-line-shaped without side wings;

[0007] The first pipe section is in a conical structure; a plurality of first side holes are arranged on the pipe wall of the second pipe section close to the first pipe section, and the first side holes are connected to the single channel; the third pipe section is in a single pigtail shape, and the pipe wall of the third pipe section may or may not be provided with side holes, and a positioning barb is arranged at the junction of the first pipe section and the second pipe section, and the pipe wall of the positioning barb may or may not be provided with side holes.

[0008] Furthermore, the single channel includes channel one, channel two and channel three which are connected in sequence from beginning to end, channel one is opened in the first pipe section, channel two is opened in the second pipe section, and channel three is opened in the third pipe section.

[0009] Furthermore, the tapered structure tapers in a direction away from the second pipe section.

[0010] Furthermore, the first side hole is elliptical.

[0011] Furthermore, the positioning barb is arranged at an angle with the tube wall of the second tube section, and is inclined toward the first tube section, and forms an acute angle with the direction of the first tube section.

[0012] Furthermore, a groove is provided on the tube wall of the second tube segment close to the third tube segment, and the positioning barb is folded and pressed against the tube wall of the first tube segment and then embedded in the groove.

[0013] Furthermore, the outer diameter of the bile duct stent is 5-10Fr, and the corresponding inner diameter is 3-8Fr.

[0014] Furthermore, the length of the bile duct stent is 5-12 cm.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The front end of the utility model is straight and has no side wings, and there is no stimulation to the bile duct wall, duodenal papilla and intestinal wall during the stent shedding process.

[0017] 2. The utility model is provided with a single pigtail and a positioning barb structure. The positioning barb can locate the depth of stent insertion to prevent the single pigtail structure from hooking on the duodenal papilla. Both the single pigtail and the positioning barb structure can promote the self-detachment of the stent.

[0018] Based on the above reasons, the utility model can be widely promoted in the fields of medical treatment and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is a schematic diagram of the first structure of the utility model.

[0021] Figure 2 This is a second structural schematic diagram of the utility model.

[0022] In the figure: 1, first pipe section; 2, second pipe section; 3, third pipe section; 4, first side hole; 5, positioning barb. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1-2 As shown, the utility model provides a bile duct stent that does not fall off without damage, and the bile duct stent is a single-channel tube with a single channel inside. The bile duct stent includes a head (first tube segment 1), a body (second tube segment 2) and a tail (third tube segment 3) that are connected in sequence from head to tail. The front of the first tube segment and the second tube segment are straight and have no side wings. The single channel includes channel one, channel two and channel three that are connected in sequence from head to tail, channel one is opened in the first tube segment, channel two is opened in the second tube segment, and channel three is opened in the third tube segment.

[0025] The head has a conical structure, and the conical structure tapers in a direction away from the body.

[0026] A plurality of elliptical first side holes 4 are provided on the tube wall of the body near the head, and the first side holes are communicated with the second channel of the single channel.

[0027] The tail is in the shape of a single pigtail, and the tube wall of the tail may or may not be provided with side holes. Figure 1 As shown in FIG. 1 , there are no side holes on the tube wall at the tail. Figure 2 As shown, a plurality of side holes are provided on the tube wall of the tail portion.

[0028] A positioning barb 5 is provided at the junction of the body and the tail. The positioning barb is arranged at an angle with the tube wall of the second tube section, and is inclined toward the first tube section, and is at an acute angle with the first tube section. A groove is provided on the tube wall of the second tube section near the third tube section, and the positioning barb is folded and pressed against the tube wall of the first tube section and then embedded in the groove. There may or may not be a side hole on the tube wall of the positioning barb.

[0029] The utility model is placed in the common bile duct over the duodenal papilla to drain bile and can fall off automatically without damaging the bile duct wall, the duodenal papilla and the intestinal wall during the falling off process.

[0030] In this embodiment, the outer diameter of the bile duct stent is 5-10 Fr, corresponding to an inner diameter of 3-8 Fr, and a length of 5-12 cm.

[0031] When the utility model is needed, a zebra guidewire is first placed in the bile duct, and the bile duct stent and the pusher are put on the guidewire. Under the guidance of the guidewire, the bile duct stent is placed in the intrahepatic bile duct. After the positioning barb of the tail is close to the duodenal papilla, the bile duct stent can be pressed down to the distal end of the duodenum. The head end of the pusher is exposed outside the duodenoscope. The pusher is fixed and the guidewire is pulled back. When the guidewire enters the lumen of the pusher, the bile duct stent is separated from the pusher, and the tail of the bile duct stent naturally forms a single pigtail structure. Fasting and using spasmolytic drugs for 24 hours after ERCP can prevent the stent from falling off early; 24 hours after the operation, the spasmolytic drugs are discontinued and semi-fluid is started. Under the stimulation of food and intestinal peristalsis, the stent can fall off when using the utility model, reducing the recurrence rate of stones caused by postoperative intestinal bile reflux.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A non-damage-and-detachable bile duct stent, characterized in that: The bile duct stent is a single-channel tube with a single channel inside; The bile duct stent comprises: a first pipe segment (1), a second pipe segment (2) and a third pipe segment (3) which are connected in sequence, wherein the first pipe segment (1) is arranged at the head, the second pipe segment (2) is arranged at the body, and the third pipe segment (3) is arranged at the tail; the front parts of the first pipe segment (1) and the second pipe segment (2) are straight-line-shaped without side wings; The first pipe section (1) is of a conical structure; a plurality of first side holes (4) are provided on the pipe wall of the second pipe section (2) close to the first pipe section (1), and the first side holes (4) are connected to the single channel; the third pipe section (3) is of a single pigtail shape, and the pipe wall of the third pipe section (3) may or may not be provided with side holes; a positioning barb (5) is provided at the junction of the first pipe section (1) and the second pipe section (2), and the pipe wall of the positioning barb (5) may or may not be provided with side holes.

2. The non-destructive and non-detachable bile duct stent according to claim 1, characterized in that: The single channel comprises channel one, channel two and channel three which are connected in sequence from beginning to end, wherein channel one is opened in the first pipe section (1), channel two is opened in the second pipe section (2), and channel three is opened in the third pipe section (3).

3. The non-destructive and non-detachable bile duct stent according to claim 1, characterized in that: The conical structure tapers in a direction away from the second pipe section (2).

4. The non-destructive and non-detachable bile duct stent according to claim 1, characterized in that: The first side hole (4) is oval in shape.

5. The non-destructive and non-detachable bile duct stent according to claim 1, characterized in that: The positioning barb (5) is arranged at an angle with the tube wall of the second tube section (2), is inclined toward the first tube section (1), and forms an acute angle with the first tube section (1).

6. The non-destructive and non-detachable bile duct stent according to claim 5, characterized in that: A groove is provided on the tube wall of the second tube section (2) close to the third tube section (3), and the positioning barb (5) is folded and pressed against the tube wall of the first tube section (1) and then embedded in the groove.

7. The non-destructive and non-detachable bile duct stent according to claim 1, characterized in that: The outer diameter of the bile duct stent is 5-10Fr, and the corresponding inner diameter is 3-8Fr.

8. The non-destructive and non-detachable bile duct stent according to claim 1 or 7, characterized in that: The length of the bile duct stent is 5-12 cm.

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